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Problems with crossfire (7970 ghz edition x2)

January 10, 2013 3:32:34 AM

Hi this is my first post, and i have a problem with crossfire on my rig.

My rig:
Sapphire 7970 ghz edition vapor x (3 gb) x2
Core i5 3570k
Asus sabertooth z77
Corsair vengeance 16 gb ddr3 (4x4)
Power supply corsair hx850.
Dell 30" wfp-hc 3007 "2560*1600" @ 60hz
Windows 8 pro

My problem is that sometimes only one card activates when playing games (sleeping dogs). Also when i activate Dx11 on games (crysis 2, far cry 3, hitman 3) it drops my fps all the way to 20 :/ . So i hope you can help me.
!